One possible fanfiction could be about a Riolu who discovers a hidden power within the mystery dungeons. It might start with Riolu being separated from its group and having to rely on its own wits and newfound abilities to survive and find its way back. Along the way, it could meet various other Pokemon and form unexpected alliances.
Riolu's personality could develop in a way that it becomes more confident. At first, it might be scared of battles and new situations. But as Ash encourages it and they have small victories, Riolu starts to believe in itself. For example, after winning a small battle against a weak pokemon, Riolu realizes it has the potential to be strong.
In these fanfictions, Ash usually has a deep sense of empathy towards Riolu. He can sense when Riolu is sad or excited. For example, if Riolu is homesick, Ash will do his best to make Riolu feel at home. He might find Riolu's favorite foods or create a comfortable place for it to sleep. His caring nature towards Riolu is a big characteristic in these stories.
Riolu may become more confident. As it transforms, it realizes it has new powers and abilities. For instance, if it gains the ability to sense auras more strongly, it becomes more self - assured in battles and interactions with other Pokemon.
One common plotline could be Riolu's transformation being triggered by a powerful emotion like protecting its trainer. For example, in some fanfictions, when the trainer is in great danger, Riolu's bond with the trainer causes it to transform into a more powerful form, perhaps Lucario. This showcases the deep connection between Pokemon and trainer.
In some fanfictions, there's a plotline where Riolu is initially distrustful of humans because of some past trauma. Ash, with his kind heart, slowly breaks through Riolu's barriers. They then train together to enter a big Pokemon tournament. Riolu's unique fighting style, combined with Ash's battle strategies, makes them a formidable team in the tournament.
One interesting Riolu fanfiction could be about Riolu's journey to become a Lucario while facing various challenges in the wild. It might include battles with other Pokemon and forming unexpected friendships.
One possible plot could be that Ash finds a Riolu as his starter pokemon. Riolu is initially very shy and distrustful of Ash. But as they go on adventures together, Riolu starts to open up. They face challenges like battling against Team Rocket who tries to steal Riolu for its potential power. Ash has to train Riolu not just in battle skills but also in trusting him completely. This journey of building trust and growing stronger together could be a great fanfiction plot.
One great Riolu fanfic could be 'The Adventures of Riolu in Pokemon Mystery Dungeon'. It really delves into Riolu's character, showing its growth and the challenges it faces in the mystery dungeon world. The author does a wonderful job of creating unique scenarios and interactions with other Pokemon.